Loss Of Flame; Extraneous Light; No Flame At The End Of Safety Time 1 (Tsa1); Flame Intensity - Siemens LMV37.4 Series Basic Documentation

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6.2.1 Loss of flame

In the event of loss of flame, the unit initiates safety shutdown, followed by a restart, if
required. A repetition counter can be used to select after how many losses of flame the
unit shall initiate lockout (refer to subsection Repetition counter).
Error Diagnostic
code code
7 0
No. Parameter
Software drop out delay time of flame signal (100 ms)
186 Index = = QRB... / QRC... (0 = inactive, >1)
Index 1 = ION / QRA... (0 = inactive, >3 - only 200 ms-steps)
Repetition limit loss of flame
240 1 = no repetition
2 = 1 repetition
Repetition limit loss of flame
280 1 = no repetition
2 = 1 repetition
Caution!
The response time of the flame detector leads to a prolongation of the second
safety time (TSA2)! This must be taken into consideration when designing the
burner!

6.2.2 Extraneous light

Extraneous light during standby (phase 12) leads to start prevention, followed by a re-
start. Extraneous light during the prepurge phase leads to immediate lockout. If extrane-
ous light occurs during the shutdown phase, the system switches to the safety phase.
One repetition is permitted. This means that if the error occurs again the next time the
system is shut down, the unit initiates lockout.
Error Diagnostic
code code
4 0
1
2

6.2.3 No flame at the end of safety time 1 (TSA1)

If no flame has been established at the end of the first safety time, the unit initiates lock-
out.
Error Diagnostic
code code
2 1
2

6.2.4 Flame intensity

The flame's intensity can be displayed.
It is standardized from 0 to 100%.
No. Parameter
954 Flame intensity
Basic documentation LMV37.4...
6 Basic unit
Meaning for the LMV37.4... system
Loss of flame
Meaning for the LMV37.4... system
Extraneous light during startup
Extraneous light during shutdown
Extraneous light during startup – start prevention
Meaning for the LMV37.4... system
No flame at the end of safety time 1 (TSA1)
No flame at the end of safety time 2 (TSA2)
CC1P7546en
01.12.2009